Advanced Task KillerSupport

I downloaded ATK out of curiousity, mostly to quickly see which apps are currently running. The first thing I noticed were apps that I had never launched were running (FM radio, voice dial, etc..) Is this normal?

2nd, I have read a lot of controversy about using a task killer. I have left the task killer alone all day, and noticed some apps never closed (browser was opened in the AM, and its still stored in mem) I know android automatically takes care of processes and tasks. Does ATK interfere with the way android manages tasks and such if I just leave it running? The settings are default in ATK.